DS1904_11 데이터 시트보기 (PDF) - Maxim Integrated

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DS1904_11

RTC iButton

Maxim Integrated 

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2

Bus

Master

1-Wire Bus

Other

Devices

DS1904

Command

Level

1-Wire ROM Function

Commands (see Figure 7)

DS1904

Available

Commands

Read ROM

Match ROM

Search ROM

Skip ROM

Data Fields

Affected

64-bit ROM

64-bit ROM

64-bit ROM

N/A

DS1904 specific

Function Commands

(see Figure 5)

Write Clock

Read Clock

RTC Counter, Device Control

RTC Counter, Device Control

64-BIT LASERED ROM Figure 3

MSB

LSB

8-Bit CRC Code

MSB

LSB MSB

48-Bit Serial Number

8-Bit Family Code (24h)

LSB MSB

LSB

1-WIRE CRC GENERATOR Figure 4

Polynomial = X8 + X5 + X4 + 1

R

S

1ST

2ND

3RD

4TH

STAGE STAGE STAGE STAGE

X0

X1

X2

X3

5TH

STAGE

X4

6TH

7TH

8TH

STAGE STAGE STAGE

X5

X6

X7

X8

INPUT DATA

3 of 13

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